What is the value of R at STP?

1) Calculate the volume of 1.62g of Helium gas at 25.670C and 872 mmHg. (R = 0.0821 atm.L/mol.K)    2)   Given the following reaction of Ca(s) in HCl(aq): Ca(s)    +     2 HCl(aq)     -->     CaCl2(aq)     +    H2(g)  If 32.7g of calcium solid are placed in this reaction and at the end of the experiment, hydrogen gas is produced at 25.000C and with a pressure of 790. mmHg. Calculate the volume of hydrogen gas produced.  3)   An unknown gas with a mass of 1.211g occupies a volume of 677 mL. The temperature is 230C and the air pressure is 0.987 atm. Calculate the molar mass of the gas.

What is the density of NO2(g) at 15.1°C and 754 mmHg? O 3.74 g/L O 1470 g/L 1.93 g/L O 5.18 g/L O 3.70 g/L

The pressure of liquid nitrogen at -197oC is 230 mmHg, what is the pressure in mmHg at 0oC?

What is the density of NO2(g) at STP?

Please answer # 24

How many grams of CO2 are contained in 5,543 mL of CO2 at STP?

1.How many grams of CO2 would occupy 118.96 liters at STP? 2.How many grams of neon would occupy 1.84 liters at STP?

What volume in liters will 1 mole of ideal gas occupy under at STP? 44.651 L 22.414 L O24.465 L 0002241 D Question 7 Which of the following is a true statement? Oceans are naturally acidic and becoming more acidic as the concentration of CO₂ in the atmosphere increases Oceans are naturally alkaline and becoming more acidic as the concentration of CO₂ in the atmosphere increases Oceans are naturally pH-neutral and becoming more alkaline as the concentration of CO₂ in the atmosphere increases None of the above. D Question 8 Acid rain is caused by which of the following compounds? Carbon dioxide and sulfur dioxide Sulfur dioxide and nitrogen oxides O Carbon monoxide and nitrogen axides None of the above D Question 9 Chesapeake Bay's poor health is mostly a result of pollution with the following Radionuclides Nutrients Pathogens O Volatile Organic Compounds